[PoachedSausage]

It was suspected that the IRA Docklands bombing[0] was possibly targeting the telecomms infrastructure. I think there were also some attempts at bombing the National Grid which failed.

You are correct that a lot of CNI is vulnerable due to its nature (remote locations etc). Thankfully, like with most terrorism, the people capable of doing the most damage are not usually interested in carrying out such acts.

[0] https://en.wikipedia.org/wiki/1996_Docklands_bombing

[walshemj]

I do wonder about the staples corner bombing that did a lot of damage and was next door to the DC that ran Telecom RED the alarm system that alerted police to break-ins as well as Telecom GOLD